/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.idfactory;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Logger;

import net.sf.l2j.Config;
import net.sf.l2j.L2DatabaseFactory;

/**
 * This class ...
 * 
 * @version $Revision: 1.2 $ $Date: 2004/06/27 08:12:59 $
 */
public class CompactionIDFactory extends IdFactory
{
    private static final Logger _log = Logger.getLogger(CompactionIDFactory.class.getName());
    
    private int _curOID;
    private int _freeSize;
    
    protected CompactionIDFactory()
    {
        super();
        _curOID = FIRST_OID;
        _freeSize = 0;

        try (Connection con = L2DatabaseFactory.getInstance().getConnection())
        {
            Integer[] tmp_obj_ids = extractUsedObjectIDTable();
            
            int N = tmp_obj_ids.length;
            for (int idx = 0; idx < N; idx++)
            {
                N = insertUntil(tmp_obj_ids, idx, N, con);
            }
            _curOID++;
            _log.config("IdFactory: Next usable Object ID is: " + _curOID);
        }
        catch (Exception e1)
        {
            e1.printStackTrace();
            _log.severe("ID Factory could not be initialized correctly:" + e1);
        }
    }
    
    private int insertUntil(Integer[] tmp_obj_ids, int idx, int N, Connection con) throws SQLException
    {
        int id = tmp_obj_ids[idx];
        if (id == _curOID)
        {
            _curOID++;
            return N;
        }
        // check these IDs not present in DB
        if (Config.BAD_ID_CHECKING)
        {
        for (String check : id_checks)
        {
            try (PreparedStatement ps = con.prepareStatement(check))
            {
                ps.setInt(1, _curOID);
                ps.setInt(2, id);
                try (ResultSet rs = ps.executeQuery())
                {
                    while (rs.next())
                    {
                        int badId = rs.getInt(1);
                        _log.severe("Bad ID " + badId + " in DB found by: " + check);
                        throw new RuntimeException();
                    }
                }
            }
        }
        }
        
        int hole = id - _curOID;
        if (hole > N - idx) hole = N - idx;
        for (int i = 1; i <= hole; i++)
        {
            id = tmp_obj_ids[N - i];
            _log.info("Compacting DB object ID=" + id + " into " + (_curOID));
            for (String update : id_updates)
            {
                try (PreparedStatement ps = con.prepareStatement(update))
                {
                    ps.setInt(1, _curOID);
                    ps.setInt(2, id);
                    ps.execute();
                }
            }
            _curOID++;
        }
        if (hole < N - idx) _curOID++;
        return N - hole;
    }

    @Override
	public synchronized int getNextId()
    {
        return _curOID++;
    }
    
    @Override
	public synchronized void releaseId(int id)
    {
    	//dont release ids until we are sure it isnt messing up
       /* if (_freeSize >= _freeOIDs.length)
        {
            int[] tmp = new int[_freeSize + STACK_SIZE_INCREMENT];
            System.arraycopy(_freeOIDs, 0, tmp, 0, _freeSize);
            _freeOIDs = tmp;
        }
        _freeOIDs[_freeSize++] = id;*/
    }
    
    @Override
	public int size()
    {
        return _freeSize + LAST_OID - FIRST_OID;
    }
}